This occured in a 4d - 4d game. If you can solve it in 30s byoyomi, you are a strong 4 dan!
(;AB[br]AB[cq]AB[cp]AB[co]AB[bn]AB[an]AW[ap]AW[cr]AB[bp]AW[bm]AW[cm]AW[cn]AW[dn]AW[do]AW[dp]AB[dq]AW[dr]AW[eq]AW[fr]AW[fq]AB[er]AW[ep]AW[ar]AB[cs]LB[ar:1]LB[cs:2]AW[bl]AW[hp]AW[jp]AP[goproblems]
(;W[es]
(;B[ao];W[bs];B[as]C[Good. Black takes the ko, but white will have no trouble with winning it as black risks too much there and black will be forced to connect at A.CHOICERIGHT]LB[bq:A])
(;B[bq];W[bs]C[The same as the other solution.RIGHT]))
(;W[am];B[ds];W[bo];B[aq]C[Double ko...]
(;W[ao];B[as]C[This is significantly worse than the solution.])
(;W[bq];B[as]C[White is taken. This is worse than the solution.]))
(;W[aq];B[ds]))